Thanks for the help Jack and Grail,
I have a couple ideas for splitting up the ghosts into fire teams. A lot of it has to do with events happening differently to the different fire teams.
I also thought it would be fun to have one team start out captured and the other ghosts would have to rescue them. I have about a million ideas for this!
Thanks a lot for your help! Hopefully I'll be done with these missions soon and I can host another coop tournament!